[WIP] Enhance UI components for forms and layouts

[Copilot]

Plan: Complete Component Library

Based on the problem statement, I need to implement/enhance the following components:

Forms Components

• Input - Already implemented
• Select - Already implemented
• Checkbox - Already implemented
• Radio - Already implemented (radio-group)
• DatePicker - Implemented with calendar and input trigger
• File Upload - Implemented with file selection and preview

Data Components

• Table - Already implemented
• List - Implemented ordered and unordered lists
• Card - Already implemented
• Tree View - Implemented collapsible tree structure

Layout Components

• Grid - Implemented responsive grid layout
• Flex - Implemented flexible box layout
• Container - Implemented max-width container
• Tabs - Already implemented

Feedback Components

• Alerts - Already implemented
• Toasts - Already implemented (toaster)
• Dialogs - Already implemented (alert-dialog, dialog)
• Loading States - Implemented loading spinner component

Implementation Complete

✅ All components have been implemented
✅ Added date-fns dependency for date formatting
✅ Updated index files to export new components
✅ Build successful
✅ Tests added and passing (9/9 tests)

Original prompt

完善组件 Forms: Input, Select, Checkbox, Radio, DatePicker, File Upload
Data: Table, List, Card, Tree View
Layout: Grid, Flex, Container, Tabs
Feedback: Alerts, Toasts, Dialogs, Loading States

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